I like to start this lesson by reading the book Just Enough Carrots.
Here is a You Tube video of the story.
I like to use this book because it really gets the kids involved in counting and understanding more and less than. The graphics in this book also help students to understand the difference between same, fewer and more.
For the standard NBT.B.2.C, it is important for students to understand why a number is more or fewer than another number. They need to have a firm understanding of the place value of the digits and be able to correctly compare numbers based on their place value.
On three index cards write 21, 15 and >. Give the cards to three volunteers. Have them arrange themselves in front of the class to make a greater than comparison. Remind students that the pointed end points to the number that is less. Discuss the comparison with the class.
If necessary, continue with different greater than comparisons and different volunteers.
Read the following problem to the class:
Read the following problem to the class. Have students use base ten blocks to model the two numbers:
Write the following on the board/chart paper:
43 < 49
Have students draw a model to show how to represent the tens and ones. Discuss how the tens are the same, so we need to compare the ones.
Have students read aloud the comparison, “43 is less than 49”
For the independent practice portion of this lesson, I like to have the students complete a worksheet.
For struggling students, allow them to use base ten blocks to help with modeling the numbers that they need to compare.
To close out this lesson, I make index cards with random numbers from 10-99 and give one to each student. I then have students mix, pair, share and discuss which student has the lesser number, and why their number is less than the other number.